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Altera_Forum's avatar
Altera_Forum
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15 years ago

How to use two interval timers

hello, i want to use two timers with my nios core. but with this code i can only use one timer. the second one wil not work. is there something wrong with my alt_irq_register(,,). declaration....
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Is the timer running?

Probably you need to initialize and start it.

Try this in main:

IOWR_ALTERA_AVALON_TIMER_CONTROL(ALPHA_BASE, 0);

IOWR_ALTERA_AVALON_TIMER_PERIODL(ALPHA_BASE, (TPERIOD-1) & ALTERA_AVALON_TIMER_PERIODL_MSK);

IOWR_ALTERA_AVALON_TIMER_PERIODH(ALPHA_BASE, ((TPERIOD-1)>>16) & ALTERA_AVALON_TIMER_PERIODL_MSK);

alt_irq_register(ALPHA_IRQ, NULL, alpha);

IOWR_ALTERA_AVALON_TIMER_CONTROL(ALPHA_BASE,

ALTERA_AVALON_TIMER_CONTROL_CONT_MSK

| ALTERA_AVALON_TIMER_CONTROL_START_MSK

| ALTERA_AVALON_TIMER_CONTROL_ITO_MSK);

Same for WAYPOINT timer.